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From Rachael Langerud

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Homemade Green Bean Casserole

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Ingredients

Warning0 allergens identified

Homemade Green Bean Casserole

nonstick cooking spray

1 lb green beans(trimmed)

8 ounces cremini mushrooms

½ yellow onion

2 cloves garlic

salt(for blanching)

2 tablespoons salted butter

1 tsp dried thyme

3 tablespoons all purpose flour

⅔ cup chicken broth

1 ⅓ cups half and half

½ tsp salt(for vegetables)

¼ tsp black pepper

¾ cup french fried onions

Instructions

Preheat the oven to 400°F.

Spray an 8- or 9-inch square baking dish with nonstick cooking spray. Set aside.

Cut the green beans into 1 1/2-inch pieces. Slice the mushrooms, finely chop the onion, and mince the garlic and set aside.

Bring a large pot of salted water to a boil. Once the water is boiling, add the green beans. Blanch until bright green, about 3 minutes. Drain the green beans in a colander and rinse with cold water.

Set a large pot over medium-high heat and add the butter. Once butter is melted, add the onions and mushrooms. Saute until mushrooms are browned and shrunken and onions are soft, 6-7 minutes. Add the garlic and thyme and cook until fragrant, about 30 seconds.

Sprinkle the flour over mushrooms and onions. Stir with a rubber spatula to coat. Slowly pour the chicken broth into the pot, whisking to dissolve flour. Pour in the half-and-half and season with the salt and black pepper.

Cook the sauce, whisking constantly, until it begins to bubble and thicken. Reduce heat to medium-low and allow sauce to simmer, whisking occasionally, until it is reduced by about a third, 5-7 minutes.

Add the green beans to pot and stir to coat with sauce. Pour green bean mixture into the prepared baking dish.

Bake the casserole on middle rack of oven for 15 minutes.

Sprinkle the french-fried onions in even layer over top. Continue baking until casserole is bubbling at edges, 5-10 minutes.

Check to see that casserole is done. Remove from oven or add time as needed.

Allow casserole to rest for 10-15 minutes before serving.

Video Tutorial Bite Tutorial

Nutrition

My Calorie Intake

1
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All Reviews
5.0

Rachael Langerud

Green bean casserole is one of my favorite dishes to make for thanksgiving. This is my first year using this recipe and it turned out amazing - highly recommend!

Nov 17, 2025

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Tips & Tricks (5)

Toast Your Mushrooms First 🍄
Sauté the cremini mushrooms in butter over high heat until golden before adding to the casserole—this concentrates their umami flavor and prevents a watery dish.
Make a True Roux Base 🥄
Cook your flour and butter together for 1-2 minutes before adding the broth to eliminate raw flour taste and create a silkier, lump-free sauce.
Reserve Half Your Fried Onions 🧅
Mix only half the fried onions into the casserole and sprinkle the rest on top just before baking—this keeps them crispy and prevents them from becoming soggy.
Blanch Green Beans Beforehand ✨
Briefly blanch fresh green beans for 3-4 minutes before adding to the casserole so they finish tender rather than crunchy or overcooked.
Use Half and Half, Not Cream 🥛
Half and half creates the perfect richness without curdling during baking, while heavy cream can break down and separate when heated with acidic ingredients like thyme.